Sorry - messed up example: corrected here... d <- "7/27/77" strptime(d, format="%m/%d/%y") # "1977-07-27 EDT" x <- strptime(d, format="%m/%d/%y")
strftime(x, format="%m/%d/%Y") # "07/27/1977" On Feb 3, 2016, at 1:29 PM, Boris Steipe <boris.ste...@utoronto.ca> wrote: > It seems your autocorrect is playing tricks on you but if I understand you > correctly you have a two digit year and want to convert that to a four digit > year? That's not uniquely possible of course; by convention, as the > documentation to strptime() says: > > On input, values 00 to 68 are prefixed by 20 and 69 to 99 by 19 – that > is the behaviour specified by the 2004 and 2008 POSIX standards... > > If this is correct for you, you need to convert the string to a time object > and the time object back to string. The format specifier %Y prints four-digit > years: > > > d <- "7/27/59" > strptime(d, format="%m/%d/%y") # "2059-07-27 EDT" > x <- strptime(d, format="%m/%d/%y") > > strftime(x, format="%m/%d/%Y") # "07/27/1977" > > > > B. > > > > > > > > On Feb 3, 2016, at 11:03 AM, carol white via R-help <r-help@r-project.org> > wrote: > >> Hi,might be trivial but how to determine the year of a date which is in the >> %m/%d/%y format and those whose year is century should be modified to ISO so >> that all date will have with year in ISO? >> Regards, >> Carol >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
